Cardioversion: Electrical System of the Heart

In
the normal heart, electrical impulses pace the rhythm at which the heart
contracts and relaxes. The sinoatrial (SA) node triggers the electrical
impulse, causing the upper chambers (atria) to contract. The signal travels
through the atrioventricular (AV) node to the atrioventricular bundle, which
divides into the Purkinje fibers. The fibers carry the signal and cause the lower
chambers (ventricles) to contract.

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